CN112569883B - Online adjusting and controlling system and method for acid liquor and alkali liquor mixed pH value - Google Patents
Online adjusting and controlling system and method for acid liquor and alkali liquor mixed pH value Download PDFInfo
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- CN112569883B CN112569883B CN202011216762.7A CN202011216762A CN112569883B CN 112569883 B CN112569883 B CN 112569883B CN 202011216762 A CN202011216762 A CN 202011216762A CN 112569883 B CN112569883 B CN 112569883B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0086—Processes carried out with a view to control or to change the pH-value; Applications of buffer salts; Neutralisation reactions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00177—Controlling or regulating processes controlling the pH
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Abstract
The invention discloses an online regulating and controlling system and a regulating and controlling method for the mixed pH value of acid liquor and alkali liquor, which comprise a reactor and a program controller; the top of the reactor is provided with an acid liquid inlet and an alkali liquid inlet; an acid liquor proportion regulating valve and an alkaline liquor proportion regulating valve are respectively arranged on a liquid inlet pipeline connecting the acid liquor inlet and the alkaline liquor inlet; a pH value sampling detection device is arranged in the reactor and is connected with the program controller; and the program controller is respectively connected with the acid liquor proportion regulating valve and the alkaline liquor proportion regulating valve, so that the opening of the acid liquor proportion regulating valve and/or the alkaline liquor proportion regulating valve can be regulated and controlled on line. The method has the advantages of accurate and timely judgment of the end point pH value, high regulation sensitivity of a feedback regulation mechanism, more accurate regulation and control quantity and capability of effectively preventing the overshoot phenomenon, thereby enabling the actually measured pH value to be always maintained in the fluctuation interval range and being beneficial to reducing the deviation of the end point pH value.
Description
Technical Field
The invention relates to the technical field of solution pH value control, in particular to an online regulating and controlling system and a regulating and controlling method for the mixed pH value of acid liquor and alkali liquor.
Background
The adjustment of pH is one of the most common technical means in chemical processes, and many chemical reactions are carried out within a specific pH range. Therefore, in order to increase the yield of the product, improve the product quality and ensure the production safety, the pH value of the reaction process needs to be accurately adjusted.
However, in the industrial production process, because the amount of the solution in the reaction kettle is too much, the conditions of slow feedback speed, lag and the like of pH value control often exist, the phenomenon of serious deviation of the key pH value occurs, the balance of a control system is influenced, and the control failure is caused.
Disclosure of Invention
The invention mainly solves the technical problem of providing an online regulating and controlling system and a regulating and controlling method for the mixed pH value of acid liquor and alkali liquor, and can solve the problems of the existing control method.
In order to solve the technical problems, the invention adopts a technical scheme that: providing an on-line regulating and controlling system for the mixed pH value of acid liquor and alkali liquor, which comprises a reactor and a program controller; the top of the reactor is provided with an acid liquid inlet and an alkali liquid inlet; an acid liquor proportion regulating valve and an alkaline liquor proportion regulating valve are respectively arranged on a liquid inlet pipeline connected with the acid liquor inlet and the alkaline liquor inlet; a pH value sampling detection device is arranged in the reactor, is connected with the program controller and feeds back the detected pH value to the program controller; and the program controller is respectively connected with the acid liquor proportion regulating valve and the alkaline liquor proportion regulating valve, so that the opening of the acid liquor proportion regulating valve and/or the alkaline liquor proportion regulating valve can be regulated and controlled on line.
In a preferred embodiment of the present invention, the pH sampling and detecting device comprises a sampling tube, a suction tube and a pH meter, wherein the sampling tube is installed at the middle lower part of the reactor, the suction tube is connected with a liquid outlet of the sampling tube, and a detection end of the pH meter is installed at a liquid outlet end of the suction tube.
In a preferred embodiment of the present invention, the acid solution and the alkali solution are rotationally mixed in the reactor, the sampling tube is installed along a tangent of the rotational direction, and the liquid inlet thereof is disposed in a counterclockwise direction of the rotational direction.
In a preferred embodiment of the present invention, the sampling tube is a diameter-variable tube, the diameter of the liquid inlet of the sampling tube is larger than that of the liquid outlet of the sampling tube, and the diameter of the tube body is gradually reduced from the liquid inlet to the liquid outlet.
In a preferred embodiment of the present invention, the suction tube is installed along a tangent line of the rotation direction, a liquid inlet of the suction tube is connected to a liquid outlet of the sampling tube, a liquid outlet of the suction tube is a bevel port and faces the wall surface of the reactor, and a detection end of the pH meter is located at the bevel port.
In a preferred embodiment of the present invention, the on-line regulating system further comprises flow meters, and the flow meters are respectively installed on the liquid inlet pipeline of the acid solution and the liquid inlet pipeline of the alkali solution.
In a preferred embodiment of the present invention, the program controller is a PLC controller.
In a preferred embodiment of the present invention, a stirrer is further installed in the reactor to rotate and mix the acid solution and the alkali solution in the reactor.
In order to solve the technical problem, the invention adopts another technical scheme that: the on-line regulating and controlling method for the mixed pH value of the acid liquor and the alkali liquor is provided, and the on-line regulating and controlling system comprises the following steps:
(1) setting parameters: presetting the pH value of an alkali liquor, the pH value of an acid liquor, a terminal pH value and a fluctuation range thereof in the program controller, and dividing the fluctuation range of the terminal pH value into a plurality of continuous intervals;
(2) regulation and control of initial pH value: before mixing begins, calculating the flow of the alkali liquor and the flow of the acid liquor required for reaching the end point pH value according to the pH value of the alkali liquor, the pH value of the acid liquor and the end point pH value, and then opening the acid liquor proportion regulating valve and the alkali liquor proportion regulating valve to enable the flow of the acid liquor and the alkali liquor passing through the flow meter to reach the calculated values;
(3) real-time online regulation and control of pH value: the pH value sampling detection device detects the initial pH value of the solution in the reactor, detects the pH value in the mixing process in real time on line, feeds the pH value back to the program controller, compares the received pH value with the end point pH value, controls the flow of the flowmeter of the acid liquor to be smaller than that of the flowmeter of the alkali liquor if the pH value is lower than the end point pH value, judges the section where the pH value is located, and regulates and controls the opening of the proportional control valve on the corresponding liquid inlet pipeline; and vice versa; and if the pH value is equal to the end point pH value, controlling the flow of the flowmeter of the acid liquor to be equal to the flow of the flowmeter of the alkali liquor.
In a preferred embodiment of the invention, the end point pH is within the interval.
The invention has the beneficial effects that: according to the online regulation and control system and the online regulation and control method for the acid liquor and alkali liquor mixed pH value, due to the installation design of a pH value sampling detection device and the design of a program controller and end point pH value interval division, the end point pH value can be accurately and timely judged, the regulation sensitivity of a feedback regulation mechanism is high, the regulation and control quantity is more accurate, and the overshoot phenomenon can be effectively prevented, so that the actually measured pH value is always maintained in the fluctuation interval range, and the deviation from the end point pH value is favorably reduced.
Drawings
FIG. 1 is a schematic perspective view of a preferred embodiment of an online pH control system for acid and alkali solutions according to the present invention;
FIG. 2 is a schematic diagram of the regulation principle of the online regulation method for the pH value of the mixture of acid liquor and alkali liquor of the invention;
the components in the drawings are numbered as follows: 1. the device comprises a reactor, 2, a program controller, 3, an acid liquid inlet, 4, an alkali liquid inlet, 5, an acid liquid container, 6, an alkali liquid container, 7, a flow meter, 8, an acid liquid proportion adjusting valve, 9, an alkali liquid proportion adjusting valve, 10, a pH value sampling detection device, 11, a sampling pipe, 12, a suction pipe, 13, a pH meter and 14, and a stirrer.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the present invention more comprehensible to those skilled in the art, and will thus provide a clear and concise definition of the scope of the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention includes:
the invention discloses an on-line regulating and controlling system for the mixed pH value of acid liquor and alkali liquor, which comprises a reactor 1 and a program controller 2.
The top of the reactor 1 is provided with an acid liquid inlet 3 and an alkali liquid inlet 4, the acid liquid inlet 3 is connected with an acid liquid container 5 through a liquid inlet pipeline, and acid liquid is conveyed into the reactor 1; the alkali liquor inlet 4 is connected with an alkali liquor container 6 through a liquid inlet pipeline, and conveys the alkali liquor into the reactor 1. And a liquid inlet pipeline connected with the acid liquid inlet 3 is provided with a flow meter 7 and an acid liquid proportion regulating valve 8, and a liquid inlet pipeline connected with the alkali liquid inlet 4 is provided with a flow meter 7 and an alkali liquid proportion regulating valve 9.
The program controller 2 is a PLC controller, and is connected to the acid liquor proportion regulating valve 8 and the alkaline liquor proportion regulating valve 9, so as to regulate and control the opening degrees of the acid liquor proportion regulating valve 8 and the alkaline liquor proportion regulating valve 9 in real time according to the pH value of the mixed liquor obtained by feedback.
The reactor 1 is internally provided with a pH value sampling detection device 10, and the pH value sampling detection device 10 is connected with the program controller 2 and is used for detecting the pH value of the mixed solution in the reactor 1 and feeding the pH value back to the program controller 2 in real time.
The reactor 1 is also provided with a stirrer 14, and the stirrer 14 is not in contact with the pH value sampling and detecting device 10. The stirring device 14 is used for stirring and mixing the acid liquor and the alkali liquor entering the reactor 1, and the reactor 1 is of a cylindrical structure, so that the stirrer 14 rotates along a fixed direction, the mixed liquor in the reactor 1 is rotated and mixed, and the mixing effect is improved.
Specifically, pH value sample detection device 10 includes sampling tube 11, suction line 12 and pH meter 13, wherein, sampling tube 11 is the reducing diameter pipe, installs reactor 1's well lower part, and the diameter of its inlet is greater than the diameter of its liquid outlet, and the diameter of pipe shaft is followed the inlet to the liquid outlet reduces gradually. The sampling tube 11 is installed along the tangent line of the rotating direction, and the liquid inlet of the sampling tube is arranged in the anticlockwise direction of the rotating direction, so that the rotating mixed liquid flows in from the liquid inlet of the sampling tube 11. By the design of the diameter-variable structure of the sampling tube 11 and the selection of the installation position, a larger amount of the mixed liquid can enter the sampling tube 11.
The suction pipe 12 is installed along the tangent line of the rotation direction, the liquid inlet of the suction pipe is connected with the liquid outlet of the sampling pipe 11, the liquid outlet of the suction pipe is an inclined plane port and faces the wall surface of the reactor 1, and the detection end of the pH meter 13 is located at the inclined plane port of the suction pipe 12. Through the design of the installation position of the sampling tube 11 and the suction tube 12, the mixed solution in the reactor 1 sequentially enters the sampling tube 11 and the suction tube 12 under the action of rotational inertia force and flows out from the outlet of the inclined plane port structure of the suction tube 12, the liquid flowing out like this is a fresh solution in the neutralization reaction process, the pH value of the fresh solution obtained by the measurement of the pH meter 13 is the latest end point value of the reaction, the pH value of the whole system can be regulated and controlled more timely and accurately through the latest end point value, the control of the pH value of the system is more accurate and sensitive, and the overshoot phenomenon can be effectively prevented.
The online regulating and controlling method for the mixed pH value of the acid liquor and the alkali liquor by adopting the online regulating and controlling system comprises the following steps:
(1) setting parameters: the pH value of the alkali liquor and the pH value of the acid liquor are preset in the program controller, and the program controller 1 can judge the required amount of the acid liquor or the alkali liquor according to the pH value of the alkali liquor and the pH value of the acid liquor, so that the inflow amount of the acid liquor or the alkali liquor is accurately and sensitively controlled;
presetting a required terminal pH value and a fluctuation range thereof in the program controller, and dividing the fluctuation range of the terminal pH value into a plurality of continuous intervals, wherein the terminal pH value is positioned in the interval range; the fluctuation range of the pH value of the whole end point is set in a partition mode, the input quantity of the acid liquor or the alkali liquor is adjusted according to the difference between the pH value and the end point value in each interval, the sensitivity of solution inflow control is improved, the feedback speed of the pH value is improved, and therefore the end point deviation of the pH value is reduced;
(2) regulation and control of initial pH value: before mixing, calculating the flow of the alkali liquor and the flow of the acid liquor required for reaching the end point pH value according to the pH value of the alkali liquor, the pH value of the acid liquor and the end point pH value, and then opening the acid liquor proportion regulating valve and the alkali liquor proportion regulating valve to enable the flow of the acid liquor and the alkali liquor passing through the flow meter to reach the calculated values;
(3) real-time online regulation and control of pH value: the pH value sampling detection device detects the initial pH value of the solution in the reactor, detects the pH value in the mixing process in real time on line, and feeds the pH value back to the program controller 2, the program controller 2 compares the pH value received each time with the terminal pH value, if the pH value is lower than the terminal pH value, the flow of the acid liquor flowmeter is controlled to be smaller than that of the alkali liquor flowmeter, the interval where the received pH value is located is judged, and the opening degree of the acid liquor proportion regulating valve 8 and/or the alkali liquor proportion regulating valve 9 on the corresponding liquid inlet pipeline is regulated and controlled according to the position of the interval where the received pH value is located; if the pH value is higher than the end point pH value, the flow of the flow meter of the acid liquor is regulated and controlled to be larger than the flow of the flow meter of the alkali liquor, the interval where the received pH value is located is judged, and the opening of the proportional regulating valve on the corresponding liquid inlet pipeline is regulated and controlled through the flow meter; if the pH value is equal to the end point pH value, controlling the opening of the acid liquor proportion regulating valve to be equal to the opening of the alkaline liquor proportion regulating valve, so that the liquid inlet amount of the acid liquor is equal to the liquid inlet amount of the alkaline liquor;
in the whole acid-base neutralization reaction process, the adjusting process is repeated, so that the p H value of the mixed liquid in the reactor is regulated and controlled in real time, and the phenomenon of over-regulation is prevented.
By the regulation and control method, the inflow of the acid liquor and the alkali liquor can be sensitively controlled, the feedback speed of the pH value is increased, and the pH value terminal deviation is reduced.
Specifically, the pH end point value is set to be 4.8, and the fluctuation range of the pH end point value is set to be 4-5.5; the following control modes are set in the PLC, and are regulated and controlled on line:
(Note
The invention relates to an online regulating system and a regulating method for the mixed pH value of acid liquor and alkali liquor, which have the following advantages:
1. through the installation design of the pH value sampling detection device, the latest end point pH value of the reaction of the acid liquor and the alkali liquor in the reactor can be accurately and timely measured, the speed and accuracy of pH value feedback are improved, and the regulation and control effect is favorably improved;
2. due to the design of the process controller and the division of the terminal pH value interval, the regulation and control quantity of the acid liquor or the alkali liquor is more accurate and sensitive, and the phenomenon of over regulation can be effectively prevented;
3. the online regulating and controlling system has the advantages of accurate and timely judgment of the pH value, high regulating sensitivity of the feedback regulating mechanism, more accurate regulating and controlling quantity and capability of effectively preventing the overshoot phenomenon, thereby enabling the actually measured pH value to be always maintained in the fluctuation interval range and being beneficial to reducing the deviation of the actually measured pH value from the terminal pH value.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. An on-line regulating and controlling system for the mixed pH value of acid liquor and alkali liquor is characterized by comprising a reactor and a program controller; the top of the reactor is provided with an acid liquid inlet and an alkali liquid inlet; an acid liquor proportion regulating valve and an alkaline liquor proportion regulating valve are respectively arranged on a liquid inlet pipeline connected with the acid liquor inlet and the alkaline liquor inlet; a pH value sampling detection device is arranged in the reactor, is connected with the program controller and feeds back the detected pH value to the program controller; the program controller is respectively connected with the acid liquor proportion regulating valve and the alkaline liquor proportion regulating valve, so that the opening of the acid liquor proportion regulating valve and/or the alkaline liquor proportion regulating valve can be regulated and controlled on line; the pH value sampling detection device comprises a sampling tube, a suction tube and a pH meter, wherein the sampling tube is arranged at the middle lower part of the reactor, the acid liquor and the alkali liquor are rotationally mixed in the reactor, the sampling tube is arranged along the tangent line of the rotation direction, and a liquid inlet of the sampling tube is arranged in the anticlockwise direction of the rotation direction; the suction pipe is connected with a liquid outlet of the sampling pipe, and the detection end of the pH meter is arranged at the liquid outlet end of the suction pipe; the sampling tube is a variable-diameter tube, the diameter of a liquid inlet of the sampling tube is larger than that of a liquid outlet of the sampling tube, and the diameter of a tube body is gradually reduced from the liquid inlet to the liquid outlet; the suction pipe is installed along the tangent line of the rotation direction, the liquid inlet of the suction pipe is connected with the liquid outlet of the sampling pipe, the liquid outlet of the suction pipe is an inclined plane port and faces the wall surface of the reactor, and the detection end of the pH meter is positioned at the inclined plane port;
the method for regulating and controlling the acid liquor and alkali liquor mixed pH value on-line regulating and controlling system comprises the following steps:
(1) setting parameters: presetting the pH value of alkali liquor, the pH value of acid liquor, a terminal pH value and a fluctuation range thereof in the program controller, and dividing the fluctuation range of the terminal pH value into a plurality of continuous intervals;
(2) regulation and control of initial pH value: before mixing begins, calculating the flow of the alkali liquor and the flow of the acid liquor required for reaching the end point pH value according to the pH value of the alkali liquor, the pH value of the acid liquor and the end point pH value, and then opening the acid liquor proportion regulating valve and the alkali liquor proportion regulating valve to enable the flow of the acid liquor and the alkali liquor passing through the flow meter to reach the calculated values;
(3) real-time online regulation and control of pH value: the pH value sampling detection device detects the initial pH value of the solution in the reactor, detects the pH value in the mixing process in real time on line, feeds the pH value back to the program controller, compares the received pH value with the end point pH value, controls the flow of the flowmeter of the acid liquor to be smaller than that of the flowmeter of the alkali liquor if the pH value is lower than the end point pH value, judges the section where the pH value is located, and regulates and controls the opening of the proportional control valve on the corresponding liquid inlet pipeline; and vice versa; and if the pH value is equal to the end point pH value, controlling the flow of the flowmeter of the acid liquor to be equal to the flow of the flowmeter of the alkali liquor.
2. The system for online regulation and control of the pH value of a mixture of acid liquor and alkali liquor as claimed in claim 1, wherein the system further comprises flow meters, and the flow meters are respectively installed on the liquid inlet pipeline of the acid liquor and the liquid inlet pipeline of the alkali liquor.
3. The system for online adjustment and control of pH of acid and alkali liquor mixture as claimed in claim 1, wherein the program controller is a PLC controller.
4. The system for online adjustment and control of the pH value of a mixture of an acid solution and an alkali solution as claimed in claim 1, wherein an agitator is further installed in the reactor, so that the acid solution and the alkali solution are rotationally mixed in the reactor.
5. The system for on-line control of the pH of a mixture of an acid and a base solution according to claim 1, wherein the end point pH is within the interval.
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| CN202011216762.7A CN112569883B (en) | 2020-11-04 | 2020-11-04 | Online adjusting and controlling system and method for acid liquor and alkali liquor mixed pH value |
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| CN202011216762.7A CN112569883B (en) | 2020-11-04 | 2020-11-04 | Online adjusting and controlling system and method for acid liquor and alkali liquor mixed pH value |
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| CN115072763A (en) * | 2021-04-29 | 2022-09-20 | 阮氏化工（常熟）有限公司 | Device and method for producing basic copper nitrate by using copper-containing stripping and hanging liquid |
| CN115703647A (en) * | 2021-08-06 | 2023-02-17 | 阮氏化工（常熟）有限公司 | Method for continuously producing basic copper carbonate by using acidic etching waste liquid |
| CN114115374A (en) * | 2021-11-30 | 2022-03-01 | 宝钢化工湛江有限公司 | System and method for regulating and controlling pH value of dephenolizing device |
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| JPS5987094A (en) * | 1982-11-11 | 1984-05-19 | Mitsubishi Gas Chem Co Inc | Waste water disposal |
| JPH05257541A (en) * | 1992-03-13 | 1993-10-08 | Hitachi Ltd | Ph controller |
| CN1188698C (en) * | 2002-11-02 | 2005-02-09 | 中国石油化工股份有限公司 | Device and method of measuring PH value |
| CN202017009U (en) * | 2011-01-29 | 2011-10-26 | 浙江大学 | Denitrification type methane anaerobic oxidized bacterium enriching system based on automatic control |
| CN202808365U (en) * | 2012-08-13 | 2013-03-20 | 瓮福（集团）有限责任公司 | Device for controlling power of hydrogen of ammonium phosphate slurry |
| CN203030273U (en) * | 2012-11-16 | 2013-07-03 | 郑州长城科工贸有限公司 | Automatic solution adding and temperature regulating reactor |
| CN104090597B (en) * | 2014-07-22 | 2016-04-13 | 长沙思辰仪器科技有限公司 | A kind of intelligent pH TT&C system and pH investigating method |
| CN209210457U (en) * | 2018-10-18 | 2019-08-06 | 江苏和顺环保有限公司 | A kind of Industry Waste concentrated acid secure processing device |
| CN209841448U (en) * | 2018-10-23 | 2019-12-24 | 深圳市新创材料科技有限公司 | Establish real-time sampling device outside reation kettle |
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